Operating means for pump jacks



June 16, 1925.

H. J. KUHLMAN OPERATING MEANS FOR PUMP JACKS Filed Nov. 5, 1923. v

Xuhlmarqy NIT Patented June 16, 1925.

'DBTATE 7 E RY J; KIUIILMANL,

PATENT OFFICE.

or COLESBURG, IOW'A.

, orERa'rIneME ns FOB PUMP .mcxs.

Application filed November ially upon the pump-jack during tliepowerimpluse than during the idle return move: ment thereof. i I i y Saidobject also comprehendsfan improve ment upon the mechanical movementwhich 1 was patented to me by the United States under Patent Number1,412,183, April 11, 1922, by the inclusion in the mechanism of animproved 'form'of rack-sector pitman adapted to permit assemblingandhousing the device in'slnall space.

The above object I have accon iplishedgf-by the means and mechanismwhich are hereinafter described and claimed, and whieh'are illustratedin the accompanying drawings, it being understood that changes intheprecise embodiment of [invention herein disclosed can be made withinthe scopeof what is claimed withoutdeparting from the spirit oftheinvention. Insaid drawings, Fig. 1v is a front end elevation of thisdevice, with the housing cover removed, and with partssectioned orbroken away or removed, and Fig. 2 is a rear end elevation of theirregularly toothed gear-wheel and its two-part driving pinion; Fig. 3is a rear elevation o'f-the lower member of the swingingfelement orrack, showing its sliding engagement with the crank: pin and theintermeshing of its rackwith the teeth of the rack-sector. I s

The numeral 4 denotes a hollow housing open at the front, with the coverremoved.

The upper part of the housing has a bear ing-opening to seat a shortpinion-shaft 1, the latter having onits outer end a beltwheel 2 carryinga driving-belt'leading to a driving pulley not shown to be rotatedpositively by a suitable prime mover, such as an internal combustionengine.

'W'ithin the hollow of the housing a relatively large gear-wheel 8 isfixed on a 5, 1923. Serial No. 672,881

stub-shaft. 9 rotatable in asuitable bearing not shown and has onitsfront face a crankpin 15, .on which. is pivotally mounted arack-sector 17 having face-teeth 18, and secured by'a sleeve or collar14: and a splitpin 16.' The teeth 18 should extend about a semi-circularare. l I r Opposite edge parts of the gear 8 have teeth 10 which from amedial point of each range thereof projeotat progressivelylessening'radii to each end of each range, that is, eccentric relativelyto the gear 8. On theopposite or rear face of this gear arcuate marginalparts 12 project rearwardly and F carry outwardly projecting teeth 13,the ranges of which are between the ends of the other ranges of teeth 10but set offtherefrom rearwardly, although the end teeth of the abuttingranges are carried across the gear edge, but in order to insure astronger structure to the gear, its marginal edge at 11 between theranges 10 is circumferentially smooth;

A two-part pinion composed of the two pinionsv 5 and 6 a're'rigidlyconnected integrally or otherwise and fixedly mounted upon the shaft 1within the housing above the "gear 8, the smaller pinion 5 being mountedeccentrically upon said shaft as is also the other pinion 6, the pinionshaving two teeth 7 in common which extend across both. The teeth of thepinion 5 meshwith the ranges of gear teeth 10, while the teeth of the"pinion 6 mesh with the ranges of teeth 13. Y A crossrshaft 19 isrotatably mounted in a bearing in the upper part of said housing toproject at both ends and serves as a rock-shaft; andon both ends of thisshaft an ,arm 24: having a terminal split 25 is fixedly clamped by meansof a bolt 26. In the outer end of this arm may be supplied a number oflongitudinallyalined holes 27 forv adjustably receiving a pintle-bolt 28which pivotally connects thereto one end of a connecting-rod 29, theother end of the rod being connected by means of a pintle 30 to anelement to be reciprocated, such as a pump-jack 31. 1

On the intermediate part of the rock-shaft 19 the upper end of anotherarm 20 fixed to depend within thehousing hollow and carries alongitudinal rack 23 which meshes with the teeth 18 on the rack-sector17. This arm 20 has a longitudinal slot 22 in a widened lower part 21which is spaced in parallel from the rack-teeth 23 and which slidinglyreceives the extremity of the crankpin '15 therethrough.

It is unnecessary here to specifically describe the operation of thepump jack by reason of the employment of the coacting two-part pinions56 and the gear-wheel 8, whereby said gear is rotated at difierentialspeeds to thus impart slower but a more powerful impulse upon thepump-jack in its working stroke, as this mechanical movement is inconstruction described and covered by my hereinbefore mentioned patent.

As the gear-wheel 8 rotates, its crank-pin 15 slides within the slot 22of the swinging arm 20-21 swinging the latter to and fro, likewiserocking the shaft 19 and the arm 24, to thus reciprocate theconnecting-rods 29 and the pump-rod 31.

The rack-sector teeth 18 in meshing with the rack-teeth 28 insure such amoving engagement therebetween as to prevent any slipping, and keep theparts together to always function the same in each of the relatedpositions thereof while moving. It will be observed that this expedientof positively actuating the swinging arm 2021 by means of theintermediate rack-sector, which might be termed a species of pitman fromthe crank-pin 15 radially to those teeth 18 which may be in mesh withthe rack teeth 23,- does away with the necessity for use of a relatively long pitman connected to the gear 8, so that the mechanical movementgearing and related elements may be all positioned within a. relativelysmall housing 4- compactly, where the hollow of the housing may befilled with a liquid lubricant and need but infrequent attention, asnecessary when the device is actuated by means of a wind-wheel inpumping.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is:

1. In combination, a rotatable body having a crank-pin thereon, anedially pivoted device having on one member a longitudinal rack and alongitudinal slot opposite thereto, and .a rack-sector pivotally mountedon said crank-pin and meshed with said rack,

said crank-pin extending loosely into said slot.

2. In combination, a rotatable body havinga crank-pin thereon, amedially pivoted device having on one member a longitudinal rack and alongitudinal slot opposite thereto, a rack-sector pivotally mounted onsaid crank-pin and meshed with said rack, said crank-pin extendingloosely into said slot, a reciprocatory body, and a connecting-rodpivot-ally connected between. and to both said reciprocatory body andthe other member of said pivoted device.

3. In combination, a rotatable body having a crank-pin thereon, amedially pivoted device having on one member a longitudinal rack and alongitudinal slot opposite thereto, a rack-sector pivotally mounted onsaid crank-pin and meshed with said rack, said crank-pin extendingloosely into said slot, a reciprocatory body, and a connecting-rodadjustably and pivotally connected between and to said reciprocatorybody and the other member of said pivoted device.

4-. In combination, a rotatable body having a crank-pin thereon, meansfor rotating said body at varying rates of speed during each rotation, aswinging arm having ,a longitudinal rack and having a longitudinal slotopposite said rack to slidingly receive the cranlnpin and a rack-sectorpivotally mounted on said crank-pin and meshing with said rack.

55. In combination, a rotatable body having a crank-pin thereon, meansfor rotating said body at varying rates of speed during each rotation, amedially pivoted device having on one member a longitudinal rank andhaving aslot parallel therewith, a racksector pivotally mounted on saidcrank-pin and meshed with said rack, .said crank-pin extending'slidinglyinto saidslot, a reciprocatory body, and linking-connections betweenanother member of said pivoted .device and said reciprocatory body, and.adjustably pivotally connected :to said member.

Signed at Waterloo, Iowa, this 51st day of November, 19.23.

HENRY J. KUHLB IAN.

